CVE-2026-98655 (GCVE-0-2026-98655)
Vulnerability from cvelistv5
Published
2026-10-18 15:44
Modified
2026-10-30 12:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.
References
Impacted products
Vendor Product Version
Linux Linux Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
Version: e17d43b93e544f5016c0251d2074c15568d5d963
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:27.085Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"
        },
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          "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
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          "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"
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        {
          "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"
        },
        {
          "url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"
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      ],
      "title": "perf: Require kernel access for text poke events",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98655",
    "datePublished": "2026-10-18T15:44:05.722Z",
    "dateReserved": "2026-09-25T10:25:14.362Z",
    "dateUpdated": "2026-10-30T12:38:27.085Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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